Blow-off for boilers



G. PURVIS.

BLOW-OFF FUR BOILERS.

APPLICATION FILED JUNE 7, I918.

Patented Aug- 31, 1920.

2 SHLETS-SHEET 1 G. PURVIS.

BLOW-UFF FOR BOILERS.

APPLICATION FILED 11m: 1, ram.

0 2 92 IT. ,E 1% 34 @m m M e M P I 0 L 0. U n a PATENT OFFICE.

GEORGE PURVIS, 07: PORT HURON, MICHIGAN.

BLOW-OFF FOR BOILERS.

Application filed June 7, 1918.

To all whom it may concern Be it known that I, Grnoncn Porous, a citizen of the United States of America, residing at Port .Huron, in the county of St. Clair and State of Michigan, have invented certain new and useful Improvements in Blow-Offs for Boilers, of which the follow ing is a specification, reference being bad to the accompanying drawings.

This invention relates to a blow oil device for boilers and particularly an arrangement thereof whereby it may be readily inserted in a place provided for the hand hole plate of a boiler, especially one of the marine type, or a similar aperture, the device being operable from the exterior of the boiler.

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

In the drawings,

Figure 1 is a view in longitudinal section, partially broken away and in elevation, of a boiler equipped with a device that embodies features of the invention;

Fig. 2 is a view in end elevation of the lower portion of the boiler;

Fig. 3 is a view in detail of a distributor taken in longitudinal section;

Fig. 4. is a view in section on or above line IV-IV of Fig. 3;

Fig. 5 is a View in detail of the exterior casing of the distributer; and

Fig. 6 is a view in detail of an indicator plate.

As herein shown in preferred form, a cylindrical casing 1 is secured at the outer end in an aperture of a boiler head 2 by studs 3 or the like which pass through an annular flange 4 of a blow off fitting 5. A plurality of conductor pipes 6 extend from nipples 7 in the casing 1 to the lower por tion of the boiler shell 8 where they terminate in a propriately formed collecting nozzles 9 w ich are so disposed as to readily indraw sediment and the like from the adjacent portions of the shell and deliver it to the conductors. An inlet ipe 10 from an appropriately positioned nipple on the easing extends to the steam space above the normal water level of the boiler where it may terminate in a grease pan 11 of suitable design.

A valve closure in the form of a sleeve 12 is rotatable in the casing 1 by means of a stem .13 which passes through a suitable packing gland 14 of the nipple 5, and which Specification of Letters Patent.

Patented Aug. 31, 1920.

Serial No. 238,799.

has a squared or splined portion 145 in. nonrotatable and longitudinally r'eciprocable engagement with a bridge 16 across the sleeve. The distance between the bridge 16 and an annular valve seat 17 on the inner end portion of the nipple 5 is such as to allow the stem, because of its engagement by coarse screw threads 18 which cause it to move longitudinally when rotated by a hand wheel 19, to shift enough so that a valve closure 20 recedes from the valve seat 17 before any one of a series of apertures 21 comes in to register with any one of the nipples T. Y

The nipples T are so disposed in regular order around and along the casing that the apertures on the ports 21 may be brought successively in to register with those nipples, an index finger 22 on the stem, which traverses a suitable dial indicator 23, advising the operator of the action and position of the distributer.

One great advantage of this arrangement is its particular adaptibility for boilers of the marine type such as indicated, in the drawings, as it can be readily secured in position after the proper fitting of the various pipes without the necessity of alining the parts inside of the boiler, and the securting it in places which are not easy of access, as the distributin valve and operating parts are a. rigid unitary structure when once secured in position, and there is no possibility of their getting out of alinement, and consequently the device is always operable.

Obviously, changes in the detail of construction may be made without departing from the spirit of the invention and I do not limit myself to any particular form and arrangement of parts.

What I claim is 1. A blow-off for boilers comprising a selective valve having a plurality of distributed nozzles and an outlet having its axis alined with the valve axis, a controllable closure for the outlet and positioned to be located within the boiler when the blowoif is in position, and means for controlling the movements of the valve and closure, said means being positioned to be accessible externally of the boiler when the blow-off is installed.

2. A blow-off of the type of claim 1 characterized in that the valve casing and outlet member are separable to permit location on op osite sides of a boiler wall, the casing an member being relatively formed to locate a. member portion within the casing, the securin means for connectingthe member and CiLSlIlfi together extending through the boiler wal 3. A blow-ofi' of the type of claim 1 characterized in that the closure for the outlet is movablein the direction of the selective valve unlit- 3 4. A=bldw-oflof the type of claim 1 characterized in that the closure for the outlet is formed with a threaded stem, rotating move ment of the stem moving the closure in the direction of the selective valve axis.

5. A blow-off for boilers comprising a selective valve havin a plni'alit of distributed nozzles and an outlet lftVlllg its axis alined with the valve axis, a controllable closure for the outlet said closure being movable 1n the direction of the valve axis and being operativcly connected to the valve to rotate the latter on its axis during closure movement.

6. A blow-oil of the type of claim 5 characterized in that the connections of closure and valve are arranged in a manner whereby activity of either of the valve nozzles is dependent upon advance movement of the closure from its seat.

7. A blow-ofi' of the type or claim 5 char acterized in that the closure is movable rotatively by an elementexposecl without the boiler, the blow-off structure having visual indication means to permit proper control movements of the element, said means including an indicator carried by and movable with the element.

8. The combination with an end wall of a boiler having an opening, of a blow-oil unit positionable on said wall to locate a portion interior of the boiler and the remainder exterior of'such boiler, said unit including a casing so ported on the inner side of the wall and eving connection with a plurality of collective nozzles, a. selective valve controllin the activity of the nozzles, an outlet line in to and. axially alined with the valve, 2mg exposed exterior of such wall, and an element operative to control saidout let and the movement of said valve.

9. The combination with a boiler having a curved lower wall and an end wall ha ving an openin spaced irom a vertical plane extending t irongh the radial center of the lower wall, of a blow-oil" device including a valve casing secured to said-end .wall and p 'o'jectin into the boiler space a distance less than that of the boiler le1igth,'a'pl1n-ality of collection-nozzleslocated adjacent such vertical plane at spaced points in the direction of boiler length, individual connections between the casing and each nozzle, and means for controlling said connections, said means incluclin a rotatable elen ient within the casing' an an element manipulating unit projecting through said opening, said unit including-a closure and seat adapted to control the outlet of the casing.

10. A paratus as in claim 9 characterized in that t 1e closureand rotatable element are operatively connected to rotate in unison and to permit relative movement in the direction of element axis.

In testimon whereof I afiix my signature in presence 0 two witnesses.

GEORGE PURVIS.

Witnesses:

ANNA M Doen, CHAS, W. Srhunrronn. 

